Lime Render

Lime
Render is a lime-based cementitious
mix applied to the external surfaces
of traditionally-built stone buildings.
It allows the building to 'breathe' - as lime is porous, it allows
for the collection and evaporation of moisture.

Cement however, an
often erroneously applied render for stone buildings,
traps moisture behind the stonework, resulting in the catastrophic
erosion of the stone masonry.